java swing 图片移动和缩放

最新推荐文章于 2025-12-16 16:02:25 发布

原创最新推荐文章于 2025-12-16 16:02:25 发布 · 364 阅读

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import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.Image;
import java.awt.Point;
import java.awt.event.MouseAdapter;
import java.awt.event.MouseEvent;

import javax.swing.*;
public class DrawImageH extends JFrame{

	DrawImageH_Panel panel;
	
	DrawImageH(){
		super("拖拽图片");
		setBounds(600, 200, 600, 600);
		setDefaultCloseOperation(EXIT_ON_CLOSE);
		panel = new DrawImageH_Panel();
		add(panel);
	}
	
	public static void main(String[] args) {
		// TODO Auto-generated method stub
		SwingUtilities.invokeLater(() ->{
			new DrawImageH().setVisible(true);
		});

	}
	private class DrawImageH_Panel extends JPanel {

		Image image = new ImageIcon("src\\bg.JPG").getImage();//这里替换需要的图片
		int x=10,y=10,width=image.getWidth(this),height=image.getHeight(this);
		//右下角缩放区域
		int area =60;
		Point 鼠标初始xy;
		Point 图片初始xy;
		//图片是否在拖拽当中
		boolean is移动ing = false;
		//图片是否在缩放当中
		boolean is缩放ing = false;
		
		DrawImageH_Panel(){
			MouseAdapter adapter = new MouseAdapter() {
				//释放按钮
				@Override
				public void mouseReleased(MouseEvent e) {
					// TODO Auto-generated method stub
					super.mouseReleased(e);
					is移动ing = false;
					is缩放ing = false;
				}
				//按下鼠标
				@Override
				public void mousePressed(MouseEvent e) {
					// TODO Auto-generated method stub
					super.mousePressed(e);
					Point p =e.getPoint();
					if(is移动area(p)) {
						is移动ing = true;
						is缩放ing = false;
						鼠标初始xy =e.getPoint();
						图片初始xy = new Point(x, y);
					}else if(is缩放area( p)) {
						is移动ing = false;
						is缩放ing = true;
					}
				}
				//鼠标按住按键后移动
				@Override
				public void mouseDragged(MouseEvent e) {
					// TODO Auto-generated method stub
					super.mouseDragged(e);
					Point p = e.getPoint();
					if(is移动ing) {
						int dx = p.x-鼠标初始xy.x;
						int dy = p.y-鼠标初始xy.y;
						x = 图片初始xy.x+dx;
						y = 图片初始xy.y+dy;
						
					}else if(is缩放ing) {
						width = Math.max(20, p.x-x);
						height =Math.max(20,p.y-y);
					}
					repaint();
				}
			};
			
			addMouseListener(adapter);
			addMouseMotionListener(adapter);
		}
		
		@Override
		protected void paintComponent(Graphics g) {
			// TODO Auto-generated method stub
			super.paintComponent(g);
			Graphics2D g2 = (Graphics2D)g;
			g2.drawImage(image, x, y, width, height, this);
			
		}
		
		//判断鼠标是否处于图片移动的区域
		public boolean is移动area(Point p) {
			if(p == null) {
				return false;
			}
			return p.x>=x && p.x<=x+width-area && p.y>=y && p.y<=x+height-area;
		}
		
		//判断鼠标是否处于图片右下角缩放区域
		public boolean is缩放area(Point p) {
			if(p == null) {
				return false;				
			}
			return p.x>=x+width-area && p.x<=x+width &&p.y>=y+height-area && y<=y+height;
		}
		
		
	}

}

这个 Java 程序实现了一个可以拖拽和缩放图片的功能，下面我将从整体功能、关键知识点和代码实现三个方面进行详细解释。